Stimulated emission of signal photons from dark matter waves

Abstract

The manipulation of quantum states of light has resulted in significant advancements in both dark matter searches and gravitational wave detectors [1-4]. Current dark matter searches operating in the microwave frequency range use nearly quantum-limited amplifiers [3, 5, 6]. Future high frequency searches will use photon counting techniques [1] to evade the standard quantum limit. We present a signal enhancement technique that utilizes a superconducting qubit to prepare a superconducting microwave cavity in a non-classical Fock state and stimulate the emission of a photon from a dark matter wave. By initializing the cavity in an $|n=4⟩$ Fock state, we demonstrate a quantum enhancement technique that increases the signal photon rate and hence also the dark matter scan rate each by a factor of 2.78. Using this technique, we conduct a dark photon search in a band around $5.965\mathrm{GHz}(24.67\mu \mathrm{eV})$, where the kinetic mixing angle $\epsilon \ge 4.35\times 10^{-13}$ is excluded at the $90\%$ confidence level.

17 pages, 17 figures

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• Stochastic waveform estimation at the fundamental quantum limit
• Autonomous Stabilization of Fock States in an Oscillator against Multiphoton Losses
• New Technologies for Axion and Dark Photon Searches
• Quantum-Enhanced Dark Matter Search Using Cat States
• Cavity as Radio Telescope for Galactic Dark Photon
• Quantum-enhanced dark matter detection with in-cavity control: mitigating the Rayleigh curse
• QuGrav: Bringing gravitational waves to light with Qumodes
• Detecting dark matter using optically trapped Rydberg atom tweezer arrays
• Lindblad estimation with fast and precise quantum control
• Physical-Layer Machine Learning with Multimode Interferometric Photon Counting